A gallon of r/o water with one teaspoon of food grade H2O2; SPRAY PLANTS LIGHTLY; wait fifteen minutes then turn your fan on. Find the source of the mold; id the mold and you find the source. Some minerial def. look like a rust mold attack. Hope this helps; pictures would.
Note: food grade H2O2 NOT 3% h2o2 from walmart or drug store.